Do you like being that extremely annoying person at parties, concerts, or sporting events that everyone wishes security would quickly escort away? That's all but guaranteed if you show up with the Deaf Leopard: a CO2-powered handheld horn that's as loud as a passing train.

What could be a more memorable prank than sneaking up behind one of your friends and scaring them half to death while causing serious hearing damage? Nothing, and that's why the Deaf Leopard's $550 price tag is totally worth the price of entry. You'll just have to provide proof you're a massive jerk before finalizing your purchase. [TShirtGun.com via Notcot]